Example
void DispatchToMainThread(std::function<void()> callback)
{
// any thread
QTimer* timer = new QTimer();
timer->moveToThread(qApp->thread());
timer->setSingleShot(true);
QObject::connect(timer, &QTimer::timeout, [=]()
{
// main thread
callback();
timer->deleteLater();
});
QMetaObject::invokeMethod(timer, "start", Qt::QueuedConnection, Q_ARG(int, 0));
}
This is useful when you need to update a UI element from a thread. Keep in mind lifetime of anything the callback references.
DispatchToMainThread([]
{
// main thread
// do UI work here
});
Same code could be adapted to run code on any thread that runs Qt event loop, thus implementing a simple dispatch mechanism.
